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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ccc262aee80c8d37d04c0d4e5a1b4b214635b392225cfea12adb43ef4215d9' 
  AND token = 'f9eFJCA+AnE6tcjWRFX2Rtbzb9yfQEXSiL0kphgbklA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}